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Subtract 9/21 from 9/36

9/36 - 9/21 is -5/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 21 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 36 × 7 = 252,
    9/36 = 9 × 7/36 × 7 = 63/252
  3. Likewise, for the 2nd fraction, since 21 × 12 = 252,
    9/21 = 9 × 12/21 × 12 = 108/252
  4. Subtract the two like fractions:
    63/252 - 108/252 = 63 - 108/252 = -45/252
  5. After reducing the fraction, the answer is -5/28

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